jerrinot - final(?) improvements

[jerrinot]

Check List:

• [x] You have run ./mvnw verify and the project builds successfully

• [x] Tests pass (./test.sh <username> shows no differences between expected and actual outputs)

• [x] All formatting changes by the build are committed

• [x] Your launch script is named calculate_average_<username>.sh (make sure to match casing of your GH user name) and is executable

• [x] Output matches that of calculate_average_baseline.sh

• [x] For new entries, or after substantial changes: When implementing custom hash structures, please point to where you deal with hash collisions (line number)

• Execution time: 1.7s

• Execution time of reference implementation: loooong

supersedes https://github.com/gunnarmorling/1brc/pull/652

[gunnarmorling]

OMG:

Benchmark 1: timeout -v 300 ./calculate_average_jerrinot.sh 2>&1
  Time (mean ± σ):      1.638 s ±  0.024 s    [User: 0.002 s, System: 0.004 s]
  Range (min … max):    1.597 s …  1.657 s    5 runs

Summary
  jerrinot: trimmed mean 1.64529769248, raw times 1.5968923114800002,1.6570793184800001,1.64792236748,1.64362821748,1.64434249248

Leaderboard

| # | Result (m:s.ms) | Implementation     | JDK | Submitter     | Notes     |
|---|-----------------|--------------------|-----|---------------|-----------|
|   | 00:01.645 | [link](https://github.com/gunnarmorling/1brc/blob/main/src/main/java/dev/morling/onebrc/CalculateAverage_jerrinot.java)| 21.0.2-graal | [Jaromir Hamala](https://github.com/jerrinot) | GraalVM native binary, uses Unsafe |

[jerrinot]

hell yeah!